These articles say how the member of Eastern Churches not in communion with Rome
and "Roman Catholics" may share each other's sacraments of Penance, Eucharist and Anointing of the Sick

Recently I heard of a tiny community of Christians in a remote part of Australia.
A priest visits once a month and they have a Catholic Mass.
Two other Sundays, other pastors visit and they attend their services.
On the final one or two Sundays, when no priest/pastor visits, they conduct their own service.

At all the above services they share in each other's Eucharists

This of course is not allowed by the present Vatican.
But it was the vision towards which Vatican II was working.

And Jesus, something tells me you are happy with the above arrangement!